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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320380792e4867466e3519ce6c4309fc0b13365a2e2344e635d5694b07c54a20' 
  AND token = 'RaKy4I/U6HQStbuzf1xoBrgxG7mmVKq5aXwdJBSxvnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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