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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9fa5c7db49823336364980ae623e9bdb6f8f5f4cb06008d60616abe34aa5a6d' 
  AND token = 'm+yplGrWz6fxIeIRITkJu6BoBqTvRLA0jGkgUHZ9nEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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