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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8295d37023060a56900de4c8e112148c32e44f42ef1e9a5cf2e5aab7c61be023' 
  AND token = 'HvrBz47DREbEusNIzs8oZdhDffL2JSDN6v9n4kM7R0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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