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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881186fa2d1882d49fe9b6f07204ae9c9611793ec4cff94020767bf3f2828f6b' 
  AND token = 'kx75ojHHMR47JzVNpjuqAqYcfmf5GEIEe6wdwiQdUVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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