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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8d94b7c911fdc536341e2c7b449aff40cb6d355aa7414a77bda40a8ec804dd' 
  AND token = 'DBXqO7CXF6LT/AeK/w1jNOcbPO4iUbMdhSyHcpfTfiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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