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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771d600f3f26280b07c01a9c8cb64e23244e3e519b210f869dce708526be1d54' 
  AND token = 'hxHxJsX6atZ9zhXmDXJQIcj1ydQX68j2FmuABFoj+kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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