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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777b601eec157d65151f9bf0d7ab162c427387aad5f570be50fac6b02bf32128' 
  AND token = 'Fgqv4IUT9bWXjL/gtr0Fsn6wvoe9mQL49/qNnzg62vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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