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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4808f3aa0e560010c1b456d477373b08cc0943ed6c051e5b0ad081c82ac888' 
  AND token = 'XYqJNiHRuQOz5xF9HqNNIF7OqctX29L9SF9djnibIdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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