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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa873300da876760bda0534b576e8db83ca027ab93c662f34137320a5b7bae5' 
  AND token = 'T3F5kP8S6X04ehwO8GCb83aU5d1ESXN1aVaASahjzsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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