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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f2bc7d7df919bc1b3971d692aad2885cefb322d3d4bca50b07b79157ef0203' 
  AND token = 'OdaRQun4D/UUc4BlOkd+C6scnfm/3lN7rtZpNPnUwgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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