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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711a9835d5632bee15857be57c3edc45012510e5f45a2a519ec0d7c7a9a30d00' 
  AND token = 'vyCB4n63ljaDw3ii/EzHmqzbhT8GBqYv5kab8V5aGCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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