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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23351d2ed0562955866e1f718c93517ee153290588ac6f0658542f6e1a6f978a' 
  AND token = 'Qt6rKEGEhpJD6c19mxdmpZ9r+7nHfSMFsd3JOlm0PDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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