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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d50341c7cb2d9ccb0f9ee2014ba2e522fd6802a7a7f5c00dc4cdc7986fb76d' 
  AND token = 'Wv1NyU6O+I5lq/Mj+xNl5wqS3fW6Wyf/V5bGZkq2kIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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