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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642354acd8978371086f17b1fd368180ba97062df33f1222d8704e016db2d167' 
  AND token = 'ATzKECoZseHa/fN4mfte9asBiK9yLQPzXX5MtIETPUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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