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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ff63699234b89c67bb481551e3852a1ba630ad481216df5237898368e92b28' 
  AND token = 'w6W8RU4ejtj4mDk1A6SEuejT2tT8GGCwwp0ViEsYZyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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