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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb94e8f059978f3834cc1d6e6ecb2d606ddd4d9cafc0a6a539bbf32ecc62cfe' 
  AND token = 'DQ76pA+halhSVpze7c2xja64rCQPxB5bUHVTCMROewg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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