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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9b12cdc24b38dceaad8c5eae8c3316da736410a70882c6888039763db8fe6b' 
  AND token = 'ywMyAhMNlMia8fMI7bc0/HCmKJ4NCXgF8bk8HidG2Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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