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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea851d22aee236a33f1086ef9e455e88caac966be8bdd6f640ad9bacf330a53b' 
  AND token = '9pOx+x4zTq7SbmBSDf7bRdPbRyh1XWNYhJwrGZsH7YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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