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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e90cbc0acaf1c4a7d1effe3a5dcc0826f4a96795b36dc0ee37b13fba8bc2e93' 
  AND token = '5Suolp+10Cy/VbXue1gAoBIiuJ9xiLKCMNuXLh4Mfg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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