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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e604096fd775db84adfc77a6ee5470ed577ee6fea37dbac210efd51baf68ed4f' 
  AND token = 'bBPt7EXpJsUTu5/opralORw5ZKagblV+DfsPUMT9Nh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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