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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac72b07753fbdc76da25d6e3f285f3fe893f00942a5b4939d22eb7c63f0daca2' 
  AND token = 'Yb2rYO6lxl6f/aeC9JcfToO/870knPdHJhQpA0pRySU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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