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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8dd98625da6b68f7ea0eaabb45c43555c7ee18ef1328cec075d4f98286d9d1' 
  AND token = 'XT/AAYorLM4SC0BlUOz3FbW4EY8JMqyUvVxjYosB+fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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