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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14565f08e7ef7f6267d60ae24825ed451b3715a387e7bd94a351b31157619878' 
  AND token = 'Nqa+bHW7ZX8Fq9Nuy+N6dWtBUmDK6Lwt/r3i5GkMdLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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