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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea15e64483ecc60e8011522f3be5dbaedf466e453b4ff52914e95ff43ee9247' 
  AND token = 'ai5Lu9B87uIyGIrMmGeQx1DWweHVZTYB6mGcF4cbQyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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