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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf6c3914110a64626e21e0591cc2a3401353968f1891d07fac397c01e300597' 
  AND token = 'NeaU3FUyWfEICuE5K2Q6szWhrGQrC+j28760/bmAy+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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