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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93a8693892fdda738afc6c12a7118c90d32dc4a6be53fd93a556f9390f11448' 
  AND token = 'UdVON7FnJFXSi6xpWYG9WzlR2lkuHcrEM1Om3+Wdrro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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