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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea35cd14eb1fab9277a4eaff4258fd5c02fbb6ac9d5fd7be8471b0b0cbe6cbb' 
  AND token = 'x4UB8xb35adxDRT0ey0G0YkJ7cYVPSZCsRV8hrg3ztY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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