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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5bc42aa1d62a51733e59d9b3defc1bfa12ad2ec4e26b6f7accefa21ed345c19' 
  AND token = 'aRXDWtbgUPittfsmsrIBYALUdm9O0Fw8+losU7+MHmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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