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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2463cc13b127fa667fc62b87fac3b7e253f83fd49d8dd6cbdc8cd8a647a30f9' 
  AND token = 'aaxx1Ur132uyqh7wOw0veXf/dV+dj7+jzKfm4l5Lwrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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