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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be65f48acfe53d1b36ebab3e57c08f7bb42a1ea9b58f9d3e2b9173e45d08c54' 
  AND token = '3GavZgPgOJkERREuejrdOhIye+cOQ/Xc0F6LG4DMJkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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