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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff856a7513f66e9746a31258deb1dee404437a9383609f206259051f1fe7dab4' 
  AND token = 'r98tMlgmeo9uCnF/1qoFt6345RQMy9/IyT/WE/fHyVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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