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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e3cd914f2076bae7562afd53273993e50639ecad72483533848d43c680abc2' 
  AND token = 'aNUgQOjy8m69ROXWgePE6I2PUg2UhjCaorufABgPv/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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