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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9f85ecf12858f7438b7cec63776c987010432facbb26c0b62c266f497b86bf' 
  AND token = 'qVucgSUIAxL1B6VTvGcbcyBHTO2mL1hWaS99BaiZnIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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