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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a204fc18a30a2f8b48937c3811d46fee7a947bef6656401afd4c015750a56f1' 
  AND token = 'McRSgAzL0JT4a8hfjBQO+cyv59d6Fxn89fN+fmpLyGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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