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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '374a0df68e0490eb10174251266ebc600d6ca18445b7ae4df7176ba851d79a7c' 
  AND token = 'J6tqGgGoQTyKLGtifoPQDhXYu1Xr3qU2ap6ChCUH9gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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