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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c341593228b1e1b42605d04dee0e9b41e3db2ece6ec7c45eb6bee8c73e461e' 
  AND token = 'Agnpt8IAzZzC8iVSXT6MytN4LNjZBZ41pIKPqXil7bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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