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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5748fa8ffa777fef92c7ade3acd6b36fb51e12978e3b84e16f1d8aea19e7d053' 
  AND token = 'SkcZj+YuKkqa+muij2fd7GmWAAErYI9IXmbNYks+Pac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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