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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b7fbbd0f683a334f4809d02de7d16bcbbe78b86e2b805f0aecdaed804edd23' 
  AND token = 'QmJ7M0riDUdPz0XubXufnhylFS55r85XeoEN2ycCBQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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