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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b799154862a574ce892676c67746c80807ef24007a0f1dbef2fe11c6d6615a4' 
  AND token = 'O3cyHiL/I3tLU4nwWuBEpUCZ9pQmaeuiNK3EvKbdRxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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