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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439d383b6c91880140daf3916ee641ad59caafebad92a28972560acb901222f5' 
  AND token = 'WPwSIFU/cZ+09kLo6wg9LQZtnSIhbA3FNM4ThC5wObs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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