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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed0dc5b31e62c0c86b8a8e02c526dd7d12548cb6f93747e005a799ec6ae79793' 
  AND token = 'rycX4OgtbLubPVUX90UOA6oup/P7Yr1iifMw8Do23xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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