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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9deef462fd23716ce0d379db1d26cac0d67a613a96dbe22195fa78d80e045412' 
  AND token = '0zNvKEWnZHrf//X1zRsd8zTbzd7iVsCapRe9qPPgEwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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