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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4efe6a16ae9c81355ab0bf2ebb2ac7c9889d7a9c996ff6d283af3590c3bf37' 
  AND token = 'XjZt4dwQXuq5Fl9O0W99gMgVWublNqXXNRy9W8WBaiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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