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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92931f36a0b45ab7c75eaae39d127dba1209141bcc2ea29241e8b9b20dafb473' 
  AND token = 'xt/FoVhhyVT4VPCkEYQVpXElvN/1VIOqaBwt/ziHEtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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