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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf69c6454e6385fd248a4d3b6bd6e76e8fde90c5070c467ddc7c5803cd7fa09' 
  AND token = 'AYbLdTkqQOeClOLCEIQt4YrEZ9ZPz7Ezrb2MTEb03GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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