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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050fe30ff7b3fc498a823e996a40f9d0e50b370dfc16a60bf76e3521c3b481d8' 
  AND token = '1Ng0ZARAdUar4nczLEv3sOb4zfX2fiW7aF++QtX0t2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}