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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36f88d7a7d3882136e55132356cd359f079c925e320186c5c92226ae208524c' 
  AND token = 'OnUZzONyLUv9eBppzGuelBfDsfQH8HB2Q5793osKhNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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