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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6efd1ada358a4ab6c5cb03e1e9bc1c8bd93f3b4e6b328b79be13bae95fe204ca' 
  AND token = 'WZxZ2J2qJahJtxAoITId6XONBzco1KwFDl8BVmd0kUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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