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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0689e392b9f290905c9f6cb80d6b95c40698130e0cc6d08993ae2b3d393df202' 
  AND token = 'AZb3IHVW21uzZBk5mqiK8V7TOjb0viz7pWulqzt9wxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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