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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6152f040b9dda2ebcbbcde7149f23e16bafc2badf62e84def32d87e15d08eca' 
  AND token = '5nJo5O6Yo8UBHGmbOtJS7zC3+VVZ6l5FyqDV2+aidHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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