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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef350e55abe56ccbe6c598de0a4129f952915a1ad4061ab8c5f93cee6c8f0f8d' 
  AND token = '06gO6FeTHyR2POH/xcu5yWoi3O3ojMZWdmQcOzEV0U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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