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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e37f5365b7e207081501ea76ffc914f53b9134a9a5e468b3d6432f09c75929' 
  AND token = 'uKtPbmREvI7Gp9tqlGkoV9pRtht91LQ9STWMQ49XQHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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