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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be8bffa80cf293a9819cfbec49777c573d8b45d59b0f9c47896c4e8274e6d6f' 
  AND token = 'UXcSykCvuVontFs5uVnUbpEcmZxo+TukcsfJckPb5AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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