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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb74e7a88c56a1c7898cfc62e1b39b51f98143a15daa7bcbd4c07ee0b9565b24' 
  AND token = 'ShVdoQ49FR0/cmZ0/kTWw+X0uCZFWg7J10u9aeoFgHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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