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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93458daf996a6352e39fb698231e967c8cd19c49545498fe9cb2fa22b3478827' 
  AND token = 'LIRF741/4ymZZ9e/Es7j3C648Hp0pWPjkqH4ozhmUJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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