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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c863c69e9bbc4efac52914f036032b30b3259af617661bc0e2a6e48fe7ebd417' 
  AND token = 'm7nJF4/uXddqrJtmGoIeEFY5HNWC31Oz5tlCjuUyiMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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