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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7f535d563a20b9d08bd7b15d2b19e99d9a7fdd945e9c0aa1f3b1ca7d1db720' 
  AND token = 'QXIC59fOw1B+N3GwTBufIy5Fxhj2/eP4vN/Rr9eVsPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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