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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201d0b28342abd332ed74dadf1cb7c0b4e216a088a31c7650e44cd132cdd205c' 
  AND token = 'Ucy85LVwNqoKEQeByagVqgpkDnAHqaPjhl9L9g+IrqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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