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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da133dff4f2fa4e550af6c8c0cec3bb533a1d909219c19f50d1fe08a5a97f84c' 
  AND token = '4HYL9fpIGeB7tYSkq71YK12BrXlcJKxjPkm/9wyWEaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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