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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b67cc9cafb85d4414d59c9d6d45d3f411e97ce3bad6cea94cd992f975255dc' 
  AND token = 'yS/rwQ3F88xJcc5UGOVZEN/bpdPx4trEQkD+JleEWGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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