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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a0c65e4efebbc9418868a9cff03f6a0ae7ef24524141fc1e418da243645fa0' 
  AND token = '7ZKQ6IXiX263mM81TgLWcePBpvlBZXOw9+/YqBtIewY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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