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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d551ad71c97dadd09a812f72d804bb68acc90a83fd334e4aa82b6ab39d5d96' 
  AND token = 'FkZQsxtLobuaS7nWSA74tQ/mkE1EYD/x8wQhGLR60WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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