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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf698ec8cc1fd003e57689fd2dc0421c2da1b3b11828b508bc32788a5820204' 
  AND token = 'inalUqDSJEiiiDIWONmH7ygNWy3tHimzZm3fS5vvA8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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