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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35444e0f2d1d8f6e56a5bc7591c565253b7b6ce33497371096e7cb44812263c' 
  AND token = 'ZGAyEtMZLW6/X5Tqxek8gGOJGCS2OFJsS68BKZv8AHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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