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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9bcd93c08dd9d06cf5a79bc30edc88d23ba5a22706e3429f98a028ebbbe87ef' 
  AND token = 'uqStmqac92pkGh/mjH0t9jixjJQqKtFo7iaY9OWyny4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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